title: Influence of calcinated and non calcinated nanobioglass particles on hardness and bioactivity of sol-gel-derived TiO2-SiO2 nano composite coatings on stainless steel substrates.
abstract: Thick films of calcinated and non calcinated nanobioglass (NBG)-titania composite coatings were prepared on stainless steel substrates by alkoxide sol-gel process. Dip-coating method was used for the films preparation. The morphology, structure and composition of the nano composite films were evaluated using environmental scanning electron microscope, X-ray diffraction and Fourier transform infrared spectroscope. The SEM investigation results showed that prepared thick NBG-titania films are smooth and free of macrocracking, fracture or flaking. The grain size of these films was uniform and nano scale (50-60 nm) which confirmed with TEM. Also FTIR confirmed the presence of Si-O-Si bands on the calcinated NBG-titania films. The hardness of the prepared films (TiO(2)-calcinated NBG and TiO(2)-Non calcinated NBG) was compared by using micro hardness test method. The results verified that the presence of calcinated NBG particles in NBG-titania composite enhanced gradually the mechanical data of the prepared films. The in vitro bioactivity of these films was discussed based on the analysis of the variations of Ca and P concentrations in the simulated body fluid (SBF) and their surface morphologies against immersion time. Surface morphology and Si-O-Si bands were found to be of great importance with respect to the bioactivity of the studied films. The results showed that calcinated NBG-titania films have better bioactivity than non calcinated NBG-titania films.
authors.affiliation: Department of Material Engineering, Islamic Azad University-Najafabad Branch, Isfahan, Iran.
authors.forename: Mohammad Saleh
authors.initials: MS
authors.lastname: Dadash
authors.forename: Saeed
authors.initials: S
authors.lastname: Karbasi
authors.forename: Mojtaba Nasr
authors.initials: MN
authors.lastname: Esfahani
authors.forename: Mohammad Reza
authors.initials: MR
authors.lastname: Ebrahimi
authors.forename: Hojatollah
authors.initials: H
authors.lastname: Vali
mesh_terms: D001672:Biocompatible Materials; D001826:Body Fluids / Q000737:chemistry; D002118:Calcium / Q000737:chemistry*; D005583:Fourier Analysis; D005898:Glass; D006244:Hardness; D053768:Metal Nanoparticles / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning / Q000379:methods; D053761:Nanocomposites / Q000737:chemistry*; D044367:Phase Transition; D011208:Powders; D012822:Silicon Dioxide / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared / Q000379:methods; D013193:Stainless Steel / Q000737:chemistry*; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D001672:Biocompatible Materials; D011208:Powders; C507641:TiO2-SiO2; D013193:Stainless Steel; D012822:Silicon Dioxide; D014025:Titanium; D002118:Calcium